Structural disorder and the origin of high-Tc suppression in La1.875Ba0.125CuO4

Author

• Daniel Haskel
• Edward A. Stern
• Fatih Dogan, Missouri University of Science and TechnologyFollow
• Arnie R. Moodenbaugh

Abstract

Polarized x-ray absorption fine structure (XAFS) measurements at all La, Pa and Cu sites were used to study local structural features that accompany the strong T_c suppression at x similar to 1/8 in La_2-xBa_xCuO₆. Two critical parameters regulating the strength of hole-lattice coupling in this material were determined, i.e., the direction and magnitude of CuO₆ octahedra local tilts. Our findings include the existence of large disorder in the magnitude of the tilt angle about its average value {theta}, with an rms {radical}{delta} {theta}{sup 2}] {approx_equal} 2{theta}. We suggest that this large disorder strongly scatters a large fraction of states at the Fermi surface for x {approx} 1/8 leading to the observed T_c suppression.

Recommended Citation

D. Haskel et al., "Structural disorder and the origin of high-Tc suppression in La1.875Ba0.125CuO4," Journal of Synchroton Radiation, vol. 6, pp. 755 - 757, International Union of Crystallography, Nov 1999.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Superconductivity; Barium Doping; Mobility Gap

International Standard Serial Number (ISSN)

0909-0495

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 International Union of Crystallography, All rights reserved

Publication Date

1999-11-01